难题.好难啊已知A=2x^2-4xy+6y^2+3x-y, B=x^2-2xy+3y^2-2x+y,如果A-2B=3a,
难题.好难啊已知A=2x^2-4xy+6y^2+3x-y, B=x^2-2xy+3y^2-2x+y,如果A-2B=3a,
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
已知A=2x^2-4xy+6y^2+3x-y,B=x^2-2xy+3y^2-2x+y,如果A-2B=3a,并且|x-a|
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x
已知:6x²-7xy-3y²+14x+y+a=(2x-3y+b)(3x+y+1)求a,b的值
若A=2x²-4xy-2y²-2x+2y,B=4x²-6xy+2y²-3x-y.
3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy
设A=2X²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y 若|